Perhaps you should try some spelling variations:
orale studien » duale studien, frage studien, scale studien
le literatura » la literatura, de literatura, e literatura
ds filosofia » di filosofia, de filosofia, da filosofia
a filosofia » la filosofia, e filosofia, di filosofia
test orale » test oracle, test oral, test oracles

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: test orale studien ((ds filosofia) OR (a filosofia)) le literatura.
• Adding a wildcard symbol may retrieve word variants: test orale studien ((ds filosofia) or (a filosofia)) le literatura*.